Pen grip



FIG. 1 is a front bottom side perspective view of the pen grip showing my new design.

FIG. 2 is a left side elevational view thereof which is a mirror image of the right side elevational view, the front elevational view and the back elevational view thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken lines depicting environmental structure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a pen grip, as shown and described. 